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    <title>正则表达式测试工具</title>
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        <h1 class="title">正则表达式测试工具</h1>
        <textarea id="userText" class="textBox" placeholder="在此输入待匹配的文本"></textarea> <!-- 有用户动作标签id都带上user -->
        <p>
            正则表达式：<input type="text" id="userRegExp">
            <input type="checkbox" name="userModifier" value="i" title = "i">忽略大小写
            <input type="checkbox" name="userModifier" value="g"  title = "g">全局匹配
            <input type="checkbox" name="userModifier" value="m"  title = "m">多行匹配
            <input id="matchingBtn" type="button" name="matchingBtn" value="测试匹配">
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